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Divergence of mitotic strategies in fission yeasts

机译：裂变酵母中有丝分裂策略的差异

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The aim of mitosis is to produce two daughter nuclei, each containing a chromosome complement identical to that of the mother nucleus. This can be accomplished through a variety of strategies, with “open” and “closed” modes of mitosis positioned at the opposite ends of the spectrum and a range of intermediate patterns in between. In the “closed” mitosis, the nuclear envelope remains intact throughout the nuclear division. In the “open” division type, the envelope of the original nucleus breaks down early in mitosis and reassembles around the segregated daughter genomes. In any case, the nuclear membrane has to remodel to accommodate the mitotic spindle assembly, chromosome segregation and formation of the daughter nuclei. We have recently shown that within the fission yeast clade, the mitotic control of the nuclear surface area may determine the choice between the nuclear envelope breakdown and a fully “closed” division. Here we discuss our data and argue that comparative cell biology studies using two fission yeast species, Schizosaccharomyces pombe and Schizosaccharomyces japonicus, could provide unprecedented insights into physiology and evolution of mitosis.
机译：有丝分裂的目的是产生两个子核，每个子核包含与母核相同的染色体补体。这可以通过多种策略来实现，其中有丝分裂的“开放”和“封闭”模式位于频谱的相对两端，并且介于两者之间的一系列中间模式。在“封闭”的有丝分裂中，整个核分裂过程中核包膜均保持完整。在“开放”分裂类型中，原始细胞核的包膜在有丝分裂早期分解，并在分离的子代基因组周围重新组装。无论如何，核膜都必须重塑以适应有丝分裂纺锤体的组装，染色体的分离和子核的形成。我们最近发现，在裂殖酵母进化枝中，核表面积的有丝分裂控制可能决定着核被膜破裂和完全“封闭”分裂之间的选择。在这里，我们讨论我们的数据，并认为使用两种裂变酵母物种（裂殖酵母和日本裂殖酵母）进行的比较细胞生物学研究可以为生理和有丝分裂的进化提供前所未有的见识。

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